The bolt-on SD Housings are compatible with the Pit Bull™ feature and the Melfred Borzall patented FastBack® Solution for direct pullback. These tough-as-nails transmitter housings are our premium offering and feature-rich. Heat-treated alloy steel provides maximum strength and durability. Keep everything tight and secure while in use with our double locking lid bolts. The SD Housings are compatible with any Ditch Witch® or Vermeer® bolt pattern.